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While a training aircraft was outside the OM on a vector for an ILS approach, the instructor pilot was notified by the approach controller that he had received an altitude alert. Later inspection revealed that the PA24's mode C transmission was malfunctioning due to a broken antenna.
| Attributes | |
| ACN | 337275 |
| Time | |
| Date | 199605 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : orf |
| State Reference | VA |
| Altitude | msl bound lower : 1600 msl bound upper : 1600 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : orf |
| Operator | general aviation : personal |
| Make Model Name | PA-24 Comanche |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | instruction : instructor |
| Qualification | pilot : cfi pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 25 flight time total : 1600 flight time type : 10 |
| ASRS Report | 337275 |
| Person 2 | |
| Affiliation | Other |
| Function | instruction : trainee |
| Qualification | pilot : private |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
This event took place at the end of a flight originally filed as IFR from iso, V1, sfq. Upon arrival in the sfq area, no signal was being received from the sfq NDB. The onboard ADF was functional and no NOTAMS were on file about the NDB. My intentions were then to divert to cpk and make a localizer approach. After 2 attempts to MDA, a landing could not be made due to low ceilings. During one of the missed approachs at cpk the controller advised my altitude mode C was intermittent with 500 ft deviations, but it apparently stabilized itself. Due to the missed approachs, my intention was then to divert to orf and the ILS runway 5. While being vectored for the intercept just prior to the LOM, the controller advised he had just received an altitude alert on me. The remainder of the approach was uneventful and the landing was made with 400 ft and 1 mi visibility. Inspection of the mode C and transponder was later done, and a broken and loose antenna was noted.
Original NASA ASRS Text
Title: WHILE A TRAINING ACFT WAS OUTSIDE THE OM ON A VECTOR FOR AN ILS APCH, THE INSTRUCTOR PLT WAS NOTIFIED BY THE APCH CTLR THAT HE HAD RECEIVED AN ALT ALERT. LATER INSPECTION REVEALED THAT THE PA24'S MODE C XMISSION WAS MALFUNCTIONING DUE TO A BROKEN ANTENNA.
Narrative: THIS EVENT TOOK PLACE AT THE END OF A FLT ORIGINALLY FILED AS IFR FROM ISO, V1, SFQ. UPON ARR IN THE SFQ AREA, NO SIGNAL WAS BEING RECEIVED FROM THE SFQ NDB. THE ONBOARD ADF WAS FUNCTIONAL AND NO NOTAMS WERE ON FILE ABOUT THE NDB. MY INTENTIONS WERE THEN TO DIVERT TO CPK AND MAKE A LOC APCH. AFTER 2 ATTEMPTS TO MDA, A LNDG COULD NOT BE MADE DUE TO LOW CEILINGS. DURING ONE OF THE MISSED APCHS AT CPK THE CTLR ADVISED MY ALT MODE C WAS INTERMITTENT WITH 500 FT DEVS, BUT IT APPARENTLY STABILIZED ITSELF. DUE TO THE MISSED APCHS, MY INTENTION WAS THEN TO DIVERT TO ORF AND THE ILS RWY 5. WHILE BEING VECTORED FOR THE INTERCEPT JUST PRIOR TO THE LOM, THE CTLR ADVISED HE HAD JUST RECEIVED AN ALT ALERT ON ME. THE REMAINDER OF THE APCH WAS UNEVENTFUL AND THE LNDG WAS MADE WITH 400 FT AND 1 MI VISIBILITY. INSPECTION OF THE MODE C AND XPONDER WAS LATER DONE, AND A BROKEN AND LOOSE ANTENNA WAS NOTED.
Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.